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//---------------------------------------------------------------------------
//
// <copyright file="FrameworkContentElement.cs" company="Microsoft">
// Copyright (C) Microsoft Corporation. All rights reserved.
// </copyright>
//
// This file was generated, please do not edit it directly.
//
// This file was generated from the codegen template located at:
// wpf\src\Graphics\codegen\mcg\generators\FrameworkElementTemplate.cs
//
// Please see http://wiki/default.aspx/Microsoft.Projects.Avalon/MilCodeGen.html for more information.
//
//---------------------------------------------------------------------------
using MS.Internal;
using MS.Utility;
using System;
using System.Collections;
using System.Diagnostics;
using System.Security;
using System.Security.Permissions;
using System.Windows.Controls;
using System.Windows.Diagnostics;
using System.Windows.Media;
using System.Windows.Markup;
using SR=System.Windows.SR;
using SRID=System.Windows.SRID;
namespace System.Windows
{
[RuntimeNamePropertyAttribute("Name")]
public partial class FrameworkContentElement
{
//------------------------------------------------------
//
// Constructors
//
//------------------------------------------------------
//------------------------------------------------------
//
// Public Methods
//
//------------------------------------------------------
#region Public Methods
/// <summary>
/// Returns logical parent
/// </summary>
public new DependencyObject Parent
{
get
{
// Verify Context Access
// VerifyAccess();
return ContextVerifiedGetParent();
}
}
/// <summary>
/// Registers the name - element combination from the
/// NameScope that the current element belongs to.
/// </summary>
/// <param name="name">Name of the element</param>
/// <param name="scopedElement">Element where name is defined</param>
public void RegisterName(string name, object scopedElement)
{
INameScope nameScope = FrameworkElement.FindScope(this);
if (nameScope != null)
{
nameScope.RegisterName(name, scopedElement);
}
else
{
throw new InvalidOperationException(SR.Get(SRID.NameScopeNotFound, name, "register"));
}
}
/// <summary>
/// Unregisters the name - element combination from the
/// NameScope that the current element belongs to.
/// </summary>
/// <param name="name">Name of the element</param>
public void UnregisterName(string name)
{
INameScope nameScope = FrameworkElement.FindScope(this);
if (nameScope != null)
{
nameScope.UnregisterName(name);
}
else
{
throw new InvalidOperationException(SR.Get(SRID.NameScopeNotFound, name, "unregister"));
}
}
/// <summary>
/// Find the object with given name in the
/// NameScope that the current element belongs to.
/// </summary>
/// <param name="name">string name to index</param>
/// <returns>context if found, else null</returns>
public object FindName(string name)
{
DependencyObject scopeOwner;
return FindName(name, out scopeOwner);
}
// internal version of FindName that returns the scope owner
internal object FindName(string name, out DependencyObject scopeOwner)
{
INameScope nameScope = FrameworkElement.FindScope(this, out scopeOwner);
if (nameScope != null)
{
return nameScope.FindName(name);
}
return null;
}
/// <summary>
/// Elements that arent connected to the tree do not receive theme change notifications.
/// We leave it upto the app author to listen for such changes and invoke this method on
/// elements that they know that arent connected to the tree. This method will update the
/// DefaultStyle for the subtree starting at the current instance.
/// </summary>
public void UpdateDefaultStyle()
{
TreeWalkHelper.InvalidateOnResourcesChange(/* fe = */ null, /* fce = */ this, ResourcesChangeInfo.ThemeChangeInfo);
}
#endregion Public Methods
//------------------------------------------------------
//
// Protected Methods
//
//------------------------------------------------------
#region Protected Methods
/// <summary>
/// Returns enumerator to logical children
/// </summary>
protected internal virtual IEnumerator LogicalChildren
{
get { return null; }
}
#endregion Protected Methods
//------------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
#region Internal Methods
/// <summary>
/// Tries to find a Resource for the given resourceKey in the current
/// element's ResourceDictionary.
/// </summary>
internal object FindResourceOnSelf(object resourceKey, bool allowDeferredResourceReference, bool mustReturnDeferredResourceReference)
{
ResourceDictionary resources = ResourcesField.GetValue(this);
if ((resources != null) && resources.Contains(resourceKey))
{
bool canCache;
return resources.FetchResource(resourceKey, allowDeferredResourceReference, mustReturnDeferredResourceReference, out canCache);
}
return DependencyProperty.UnsetValue;
}
internal DependencyObject ContextVerifiedGetParent()
{
return _parent;
}
//
protected internal void AddLogicalChild(object child)
{
if (child != null)
{
// It is invalid to modify the children collection that we
// might be iterating during a property invalidation tree walk.
if (IsLogicalChildrenIterationInProgress)
{
throw new InvalidOperationException(SR.Get(SRID.CannotModifyLogicalChildrenDuringTreeWalk));
}
// Now that the child is going to be added, the FE/FCE construction is considered finished,
// so we do not expect a change of InheritanceBehavior property,
// so we can pick up properties from styles and resources.
TryFireInitialized();
bool exceptionThrown = true;
try
{
HasLogicalChildren = true;
// Child is present; reparent him to this element
FrameworkObject fo = new FrameworkObject(child as DependencyObject);
fo.ChangeLogicalParent(this);
exceptionThrown = false;
}
finally
{
if (exceptionThrown)
{
//
// Consider doing this...
//RemoveLogicalChild(child);
}
}
}
}
//
protected internal void RemoveLogicalChild(object child)
{
if (child != null)
{
// It is invalid to modify the children collection that we
// might be iterating during a property invalidation tree walk.
if (IsLogicalChildrenIterationInProgress)
{
throw new InvalidOperationException(SR.Get(SRID.CannotModifyLogicalChildrenDuringTreeWalk));
}
// Child is present
FrameworkObject fo = new FrameworkObject(child as DependencyObject);
if (fo.Parent == this)
{
fo.ChangeLogicalParent(null);
}
// This could have been the last child, so check if we have any more children
IEnumerator children = LogicalChildren;
// if null, there are no children.
if (children == null)
{
HasLogicalChildren = false;
}
else
{
// If we can move next, there is at least one child
HasLogicalChildren = children.MoveNext();
}
}
}
/// <summary>
/// Invoked when logical parent is changed. This just
/// sets the parent pointer.
/// </summary>
/// <remarks>
/// A parent change is considered catastrohpic and results in a large
/// amount of invalidations and tree traversals. <cref see="DependencyFastBuild"/>
/// is recommended to reduce the work necessary to build a tree
/// </remarks>
/// <param name="newParent">
/// New parent that was set
/// </param>
internal void ChangeLogicalParent(DependencyObject newParent)
{
///////////////////
// OnNewParent:
///////////////////
//
// -- Approved By The Core Team --
//
// Do not allow foreign threads to change the tree.
// (This is a noop if this object is not assigned to a Dispatcher.)
//
// We also need to ensure that the tree is homogenous with respect
// to the dispatchers that the elements belong to.
//
this.VerifyAccess();
if(newParent != null)
{
newParent.VerifyAccess();
}
// Logical Parent must first be dropped before you are attached to a newParent
// This mitigates illegal tree state caused by logical child stealing as illustrated in bug 970706
if (_parent != null && newParent != null && _parent != newParent)
{
throw new System.InvalidOperationException(SR.Get(SRID.HasLogicalParent));
}
// Trivial check to avoid loops
if (newParent == this)
{
throw new System.InvalidOperationException(SR.Get(SRID.CannotBeSelfParent));
}
// invalid during a VisualTreeChanged event
VisualDiagnostics.VerifyVisualTreeChange(this);
// Logical Parent implies no InheritanceContext
if (newParent != null)
{
ClearInheritanceContext();
}
IsParentAnFE = newParent is FrameworkElement;
DependencyObject oldParent = _parent;
OnNewParent(newParent);
// Update Has[Loaded/Unloaded]Handler Flags
BroadcastEventHelper.AddOrRemoveHasLoadedChangeHandlerFlag(this, oldParent, newParent);
// Fire Loaded and Unloaded Events
BroadcastEventHelper.BroadcastLoadedOrUnloadedEvent(this, oldParent, newParent);
///////////////////
// OnParentChanged:
///////////////////
// Invalidate relevant properties for this subtree
DependencyObject parent = (newParent != null) ? newParent : oldParent;
TreeWalkHelper.InvalidateOnTreeChange(/* fe = */ null, /* fce = */ this, parent, (newParent != null));
// If no one has called BeginInit then mark the element initialized and fire Initialized event
// (non-parser programmatic tree building scenario)
TryFireInitialized();
}
/// <summary>
/// Called before the parent is chanded to the new value.
/// </summary>
internal virtual void OnNewParent(DependencyObject newParent)
{
//
// This API is only here for compatability with the old
// behavior. Note that FrameworkElement does not have
// this virtual, so why do we need it here?
//
DependencyObject oldParent = _parent;
_parent = newParent;
// Synchronize ForceInherit properties
if(_parent != null)
{
UIElement.SynchronizeForceInheritProperties(null, this, null, _parent);
}
else
{
UIElement.SynchronizeForceInheritProperties(null, this, null, oldParent);
}
// Synchronize ReverseInheritProperty Flags
//
// NOTE: do this AFTER synchronizing force-inherited flags, since
// they often effect focusability and such.
this.SynchronizeReverseInheritPropertyFlags(oldParent, false);
}
// OnAncestorChangedInternal variant when we know what type (FE/FCE) the
// tree node is.
/// <SecurityNote>
/// Critical: This code calls into PresentationSource.OnAncestorChanged which is link demand protected
/// it does so only for content elements and not for FEs. But if called externally and configured
/// inappropriately it can be used to change the tree
/// TreatAsSafe: This does not let you get at the presentationsource which is what we do not want to expose
/// </SecurityNote>
[SecurityCritical,SecurityTreatAsSafe]
internal void OnAncestorChangedInternal(TreeChangeInfo parentTreeState)
{
// Cache the IsSelfInheritanceParent flag
bool wasSelfInheritanceParent = IsSelfInheritanceParent;
if (parentTreeState.Root != this)
{
// Clear the HasStyleChanged flag
HasStyleChanged = false;
HasStyleInvalidated = false;
}
// If this is a tree add operation update the ShouldLookupImplicitStyles
// flag with respect to your parent.
if (parentTreeState.IsAddOperation)
{
FrameworkObject fo =
new FrameworkObject(null, this);
fo.SetShouldLookupImplicitStyles();
}
// Invalidate ResourceReference properties
if (HasResourceReference)
{
// This operation may cause a style change and hence should be done before the call to
// InvalidateTreeDependents as it relies on the HasStyleChanged flag
TreeWalkHelper.OnResourcesChanged(this, ResourcesChangeInfo.TreeChangeInfo, false);
}
// If parent is a FrameworkElement
// This is also an operation that could change the style
FrugalObjectList<DependencyProperty> currentInheritableProperties =
InvalidateTreeDependentProperties(parentTreeState, IsSelfInheritanceParent, wasSelfInheritanceParent);
// we have inherited properties that changes as a result of the above;
// invalidation; push that list of inherited properties on the stack
// for the children to use
parentTreeState.InheritablePropertiesStack.Push(currentInheritableProperties);
// Notify the PresentationSource that this element's ancestry may have changed.
// We only need the ContentElement's because UIElements are taken care of
// through the Visual class.
PresentationSource.OnAncestorChanged(this);
// Call OnAncestorChanged
OnAncestorChanged();
// Notify mentees if they exist
if (PotentiallyHasMentees)
{
// Raise the ResourcesChanged Event so that ResourceReferenceExpressions
// on non-[FE/FCE] listening for this can then update their values
RaiseClrEvent(FrameworkElement.ResourcesChangedKey, EventArgs.Empty);
}
}
// Invalidate all the properties that may have changed as a result of
// changing this element's parent in the logical (and sometimes visual tree.)
internal FrugalObjectList<DependencyProperty> InvalidateTreeDependentProperties(TreeChangeInfo parentTreeState, bool isSelfInheritanceParent, bool wasSelfInheritanceParent)
{
AncestorChangeInProgress = true;
try
{
// Style property is a special case of a non-inherited property that needs
// invalidation for parent changes. Invalidate StyleProperty if it hasn't been
// locally set because local value takes precedence over implicit references
if (!HasLocalStyle && (this != parentTreeState.Root))
{
UpdateStyleProperty();
}
Style selfStyle = null;
Style selfThemeStyle = null;
DependencyObject templatedParent = null;
int childIndex = -1;
ChildRecord childRecord = new ChildRecord();
bool isChildRecordValid = false;
selfStyle = Style;
selfThemeStyle = ThemeStyle;
templatedParent = TemplatedParent;
childIndex = TemplateChildIndex;
// StyleProperty could have changed during invalidation of ResourceReferenceExpressions if it
// were locally set or during the invalidation of unresolved implicitly referenced style
bool hasStyleChanged = HasStyleChanged;
// Fetch selfStyle, hasStyleChanged and childIndex for the current node
FrameworkElement.GetTemplatedParentChildRecord(templatedParent, childIndex, out childRecord, out isChildRecordValid);
FrameworkElement parentFE;
FrameworkContentElement parentFCE;
bool hasParent = FrameworkElement.GetFrameworkParent(this, out parentFE, out parentFCE);
DependencyObject parent = null;
InheritanceBehavior parentInheritanceBehavior = InheritanceBehavior.Default;
if (hasParent)
{
if (parentFE != null)
{
parent = parentFE;
parentInheritanceBehavior = parentFE.InheritanceBehavior;
}
else
{
parent = parentFCE;
parentInheritanceBehavior = parentFCE.InheritanceBehavior;
}
}
if (!TreeWalkHelper.SkipNext(InheritanceBehavior) && !TreeWalkHelper.SkipNow(parentInheritanceBehavior))
{
// Synchronize InheritanceParent
this.SynchronizeInheritanceParent(parent);
}
else if (!IsSelfInheritanceParent)
{
// Set IsSelfInheritanceParet on the root node at a tree boundary
// so that all inheritable properties are cached on it.
SetIsSelfInheritanceParent();
}
// Loop through all cached inheritable properties for the parent to see if they should be invalidated.
return TreeWalkHelper.InvalidateTreeDependentProperties(parentTreeState, /* fe = */ null, /* fce = */ this, selfStyle, selfThemeStyle,
ref childRecord, isChildRecordValid, hasStyleChanged, isSelfInheritanceParent, wasSelfInheritanceParent);
}
finally
{
AncestorChangeInProgress = false;
}
}
/// <summary>
/// Check if the current element has a Loaded/Unloaded Change Handler.
/// </summary>
/// <remarks>
/// This is called this when a loaded handler element is removed.
/// We need to check if the parent should clear or maintain the
/// SubtreeHasLoadedChangeHandler bit. For example the parent may also
/// have a handler.
/// This could be more efficent if it were a bit on the element,
/// set and cleared when the handler or templates state changes. I expect
/// Event Handler state changes less often than element parentage.
/// </remarks>
internal bool ThisHasLoadedChangeEventHandler
{
get
{
if (null != EventHandlersStore)
{
if (EventHandlersStore.Contains(LoadedEvent) || EventHandlersStore.Contains(UnloadedEvent))
{
return true;
}
}
if(null != Style && Style.HasLoadedChangeHandler)
{
return true;
}
if(null != ThemeStyle && ThemeStyle.HasLoadedChangeHandler)
{
return true;
}
if(HasFefLoadedChangeHandler)
{
return true;
}
return false;
}
}
internal bool HasFefLoadedChangeHandler
{
get
{
if(null == TemplatedParent)
{
return false;
}
FrameworkElementFactory fefRoot = BroadcastEventHelper.GetFEFTreeRoot(TemplatedParent);
if(null == fefRoot)
{
return false;
}
FrameworkElementFactory fef = StyleHelper.FindFEF(fefRoot, TemplateChildIndex);
if(null == fef)
{
return false;
}
return fef.HasLoadedChangeHandler;
}
}
/// <summary>
/// This method causes the StyleProperty to be re-evaluated
/// </summary>
internal void UpdateStyleProperty()
{
if (!HasStyleInvalidated)
{
if (IsStyleUpdateInProgress == false)
{
IsStyleUpdateInProgress = true;
try
{
InvalidateProperty(StyleProperty);
HasStyleInvalidated = true;
}
finally
{
IsStyleUpdateInProgress = false;
}
}
else
{
throw new InvalidOperationException(SR.Get(SRID.CyclicStyleReferenceDetected, this));
}
}
}
/// <summary>
/// This method causes the ThemeStyleProperty to be re-evaluated
/// </summary>
internal void UpdateThemeStyleProperty()
{
if (IsThemeStyleUpdateInProgress == false)
{
IsThemeStyleUpdateInProgress = true;
try
{
StyleHelper.GetThemeStyle(/* fe = */ null, /* fce = */ this);
// Update the ContextMenu and ToolTips separately because they aren't in the tree
ContextMenu contextMenu =
GetValueEntry(
LookupEntry(ContextMenuProperty.GlobalIndex),
ContextMenuProperty,
null,
RequestFlags.DeferredReferences).Value as ContextMenu;
if (contextMenu != null)
{
TreeWalkHelper.InvalidateOnResourcesChange(contextMenu, null, ResourcesChangeInfo.ThemeChangeInfo);
}
DependencyObject toolTip =
GetValueEntry(
LookupEntry(ToolTipProperty.GlobalIndex),
ToolTipProperty,
null,
RequestFlags.DeferredReferences).Value as DependencyObject;
if (toolTip != null)
{
FrameworkObject toolTipFO = new FrameworkObject(toolTip);
if (toolTipFO.IsValid)
{
TreeWalkHelper.InvalidateOnResourcesChange(toolTipFO.FE, toolTipFO.FCE, ResourcesChangeInfo.ThemeChangeInfo);
}
}
OnThemeChanged();
}
finally
{
IsThemeStyleUpdateInProgress = false;
}
}
else
{
throw new InvalidOperationException(SR.Get(SRID.CyclicThemeStyleReferenceDetected, this));
}
}
// Called when the theme changes so resources not in the tree can be updated by subclasses
internal virtual void OnThemeChanged()
{
}
///<summary>
/// Initiate the processing for Loaded event broadcast starting at this node
/// </summary>
/// <remarks>
/// This method is to allow firing Loaded event from a Helper class since the override is protected
/// </remarks>
internal void FireLoadedOnDescendentsInternal()
{
// This is to prevent duplicate Broadcasts for the Loaded event
if (LoadedPending == null)
{
DependencyObject parent = Parent;
// Check if this Loaded cancels against a previously queued Unloaded event
// Note that if the Loaded and the Unloaded do not change the position of
// the node within the loagical tree they are considered to cancel each other out.
object[] unloadedPending = UnloadedPending;
if (unloadedPending == null || unloadedPending[2] != parent)
{
// Add a callback to the MediaContext which will be called
// before the first render after this point
BroadcastEventHelper.AddLoadedCallback(this, parent);
}
else
{
// Dequeue Unloaded
BroadcastEventHelper.RemoveUnloadedCallback(this, unloadedPending);
}
}
}
///<summary>
/// Broadcast Unloaded event starting at this node
/// </summary>
internal void FireUnloadedOnDescendentsInternal()
{
// This is to prevent duplicate Broadcasts for the Unloaded event
if (UnloadedPending == null)
{
DependencyObject parent = Parent;
// Check if this Unloaded cancels against a previously queued Loaded event
// Note that if the Loaded and the Unloaded do not change the position of
// the node within the loagical tree they are considered to cancel each other out.
object[] loadedPending = LoadedPending;
if (loadedPending == null)
{
// Add a callback to the MediaContext which will be called
// before the first render after this point
BroadcastEventHelper.AddUnloadedCallback(this, parent);
}
else
{
// Dequeue Loaded
BroadcastEventHelper.RemoveLoadedCallback(this, loadedPending);
}
}
}
/// <summary>
/// You are about to provided as the InheritanceContext for the target.
/// You can choose to allow this or not.
/// </summary>
internal override bool ShouldProvideInheritanceContext(DependencyObject target, DependencyProperty property)
{
// return true if the target is neither a FE or FCE
FrameworkObject fo = new FrameworkObject(target);
return !fo.IsValid;
}
// Define the DO's inheritance context
internal override DependencyObject InheritanceContext
{
get { return InheritanceContextField.GetValue(this); }
}
/// <summary>
/// You have a new InheritanceContext
/// </summary>
/// <remarks>
/// This is to solve the case of programmatically creating a VisualBrush or BitmapCacheBrush
/// with an element in it and the element not getting Initialized.
/// </remarks>
internal override void AddInheritanceContext(DependencyObject context, DependencyProperty property)
{
base.AddInheritanceContext(context, property);
// Initialize, if not already done
TryFireInitialized();
// accept the new inheritance context provided that
// a) the requested link uses VisualBrush.Visual or BitmapCacheBrush.TargetProperty
// b) this element has no visual or logical parent
// c) the context does not introduce a cycle
if ((property == VisualBrush.VisualProperty || property == BitmapCacheBrush.TargetProperty)
&& FrameworkElement.GetFrameworkParent(this) == null
//!FrameworkObject.IsEffectiveAncestor(this, context, property))
&& !FrameworkObject.IsEffectiveAncestor(this, context))
{
//FrameworkObject.Log("+ {0}", FrameworkObject.LogIC(context, property, this));
if (!HasMultipleInheritanceContexts && InheritanceContext == null)
{
// first request - accept the new inheritance context
InheritanceContextField.SetValue(this, context);
OnInheritanceContextChanged(EventArgs.Empty);
}
else if (InheritanceContext != null)
{
// second request - remove all context and enter "shared" mode
InheritanceContextField.ClearValue(this);
WriteInternalFlag2(InternalFlags2.HasMultipleInheritanceContexts, true);
OnInheritanceContextChanged(EventArgs.Empty);
}
// else already in shared mode - ignore the request
}
}
// Remove an inheritance context
internal override void RemoveInheritanceContext(DependencyObject context, DependencyProperty property)
{
if (InheritanceContext == context)
{
//FrameworkObject.Log("- {0}", FrameworkObject.LogIC(context, property, this));
InheritanceContextField.ClearValue(this);
OnInheritanceContextChanged(EventArgs.Empty);
}
base.RemoveInheritanceContext(context, property);
}
// Clear the inheritance context (called when the element
// gets a real parent
private void ClearInheritanceContext()
{
if (InheritanceContext != null)
{
InheritanceContextField.ClearValue(this);
OnInheritanceContextChanged(EventArgs.Empty);
}
}
/// <summary>
/// This is a means for subclasses to get notification
/// of InheritanceContext changes and then they can do
/// their own thing.
/// </summary>
internal override void OnInheritanceContextChangedCore(EventArgs args)
{
DependencyObject oldMentor = MentorField.GetValue(this);
DependencyObject newMentor = Helper.FindMentor(InheritanceContext);
if (oldMentor != newMentor)
{
MentorField.SetValue(this, newMentor);
if (oldMentor != null)
{
DisconnectMentor(oldMentor);
}
if (newMentor != null)
{
ConnectMentor(newMentor);
}
}
}
// connect to a new mentor
void ConnectMentor(DependencyObject mentor)
{
FrameworkObject foMentor = new FrameworkObject(mentor);
// register for InheritedPropertyChanged events
foMentor.InheritedPropertyChanged += new InheritedPropertyChangedEventHandler(OnMentorInheritedPropertyChanged);
// register for ResourcesChanged events
foMentor.ResourcesChanged += new EventHandler(OnMentorResourcesChanged);
// invalidate the mentee's tree
TreeWalkHelper.InvalidateOnTreeChange(
null, this,
foMentor.DO,
true /* isAddOperation */
);
// register for Loaded/Unloaded events.
// Do this last so the tree is ready when Loaded is raised.
if (this.SubtreeHasLoadedChangeHandler)
{
bool isLoaded = foMentor.IsLoaded;
ConnectLoadedEvents(ref foMentor, isLoaded);
if (isLoaded)
{
this.FireLoadedOnDescendentsInternal();
}
}
}
// disconnect from an old mentor
void DisconnectMentor(DependencyObject mentor)
{
FrameworkObject foMentor = new FrameworkObject(mentor);
// unregister for InheritedPropertyChanged events
foMentor.InheritedPropertyChanged -= new InheritedPropertyChangedEventHandler(OnMentorInheritedPropertyChanged);
// unregister for ResourcesChanged events
foMentor.ResourcesChanged -= new EventHandler(OnMentorResourcesChanged);
// invalidate the mentee's tree
TreeWalkHelper.InvalidateOnTreeChange(
null, this,
foMentor.DO,
false /* isAddOperation */
);
// unregister for Loaded/Unloaded events
if (this.SubtreeHasLoadedChangeHandler)
{
bool isLoaded = foMentor.IsLoaded;
DisconnectLoadedEvents(ref foMentor, isLoaded);
if (foMentor.IsLoaded)
{
this.FireUnloadedOnDescendentsInternal();
}
}
}
// called by BroadcastEventHelper when the SubtreeHasLoadedChangedHandler
// flag changes on a mentored FE/FCE
internal void ChangeSubtreeHasLoadedChangedHandler(DependencyObject mentor)
{
FrameworkObject foMentor = new FrameworkObject(mentor);
bool isLoaded = foMentor.IsLoaded;
if (this.SubtreeHasLoadedChangeHandler)
{
ConnectLoadedEvents(ref foMentor, isLoaded);
}
else
{
DisconnectLoadedEvents(ref foMentor, isLoaded);
}
}
// handle the Loaded event from the mentor
void OnMentorLoaded(object sender, RoutedEventArgs e)
{
FrameworkObject foMentor = new FrameworkObject((DependencyObject)sender);
// stop listening for Loaded, start listening for Unloaded
foMentor.Loaded -= new RoutedEventHandler(OnMentorLoaded);
foMentor.Unloaded += new RoutedEventHandler(OnMentorUnloaded);
// broadcast the Loaded event to my framework subtree
//FireLoadedOnDescendentsInternal();
BroadcastEventHelper.BroadcastLoadedSynchronously(this, IsLoaded);
}
// handle the Unloaded event from the mentor
void OnMentorUnloaded(object sender, RoutedEventArgs e)
{
FrameworkObject foMentor = new FrameworkObject((DependencyObject)sender);
// stop listening for Unloaded, start listening for Loaded
foMentor.Unloaded -= new RoutedEventHandler(OnMentorUnloaded);
foMentor.Loaded += new RoutedEventHandler(OnMentorLoaded);
// broadcast the Unloaded event to my framework subtree
//FireUnloadedOnDescendentsInternal();
BroadcastEventHelper.BroadcastUnloadedSynchronously(this, IsLoaded);
}
void ConnectLoadedEvents(ref FrameworkObject foMentor, bool isLoaded)
{
if (foMentor.IsValid)
{
if (isLoaded)
{
foMentor.Unloaded += new RoutedEventHandler(OnMentorUnloaded);
}
else
{
foMentor.Loaded += new RoutedEventHandler(OnMentorLoaded);
}
}
}
void DisconnectLoadedEvents(ref FrameworkObject foMentor, bool isLoaded)
{
if (foMentor.IsValid)
{
if (isLoaded)
{
foMentor.Unloaded -= new RoutedEventHandler(OnMentorUnloaded);
}
else
{
foMentor.Loaded -= new RoutedEventHandler(OnMentorLoaded);
}
}
}
// handle the InheritedPropertyChanged event from the mentor
void OnMentorInheritedPropertyChanged(object sender, InheritedPropertyChangedEventArgs e)
{
TreeWalkHelper.InvalidateOnInheritablePropertyChange(
null, this,
e.Info, false /*skipStartNode*/);
}
// handle the ResourcesChanged event from the mentor
void OnMentorResourcesChanged(object sender, EventArgs e)
{
TreeWalkHelper.InvalidateOnResourcesChange(
null, this,
ResourcesChangeInfo.CatastrophicDictionaryChangeInfo);
}
// Helper method to retrieve and fire the InheritedPropertyChanged event
internal void RaiseInheritedPropertyChangedEvent(ref InheritablePropertyChangeInfo info)
{
EventHandlersStore store = EventHandlersStore;
if (store != null)
{
Delegate handler = store.Get(FrameworkElement.InheritedPropertyChangedKey);
if (handler != null)
{
InheritedPropertyChangedEventArgs args = new InheritedPropertyChangedEventArgs(ref info);
((InheritedPropertyChangedEventHandler)handler)(this, args);
}
}
}
#endregion Internal Methods
//------------------------------------------------------
//
// Internal Properties
//
//------------------------------------------------------
#region Internal Properties
// Indicates if the Style is being re-evaluated
internal bool IsStyleUpdateInProgress
{
get { return ReadInternalFlag(InternalFlags.IsStyleUpdateInProgress); }
set { WriteInternalFlag(InternalFlags.IsStyleUpdateInProgress, value); }
}
// Indicates if the ThemeStyle is being re-evaluated
internal bool IsThemeStyleUpdateInProgress
{
get { return ReadInternalFlag(InternalFlags.IsThemeStyleUpdateInProgress); }
set { WriteInternalFlag(InternalFlags.IsThemeStyleUpdateInProgress, value); }
}
// Indicates that we are storing "container template" provided values
// on this element -- see StyleHelper.ParentTemplateValuesField
internal bool StoresParentTemplateValues
{
get { return ReadInternalFlag(InternalFlags.StoresParentTemplateValues); }
set { WriteInternalFlag(InternalFlags.StoresParentTemplateValues, value); }
}
// Indicates if this instance has had NumberSubstitutionChanged on it
internal bool HasNumberSubstitutionChanged
{
get { return ReadInternalFlag(InternalFlags.HasNumberSubstitutionChanged); }
set { WriteInternalFlag(InternalFlags.HasNumberSubstitutionChanged, value); }
}
// Indicates if this instance has a tree that
// was generated via a Template
internal bool HasTemplateGeneratedSubTree
{
get { return ReadInternalFlag(InternalFlags.HasTemplateGeneratedSubTree); }
set { WriteInternalFlag(InternalFlags.HasTemplateGeneratedSubTree, value); }
}
// Indicates if this instance has an implicit style
internal bool HasImplicitStyleFromResources
{
get { return ReadInternalFlag(InternalFlags.HasImplicitStyleFromResources); }
set { WriteInternalFlag(InternalFlags.HasImplicitStyleFromResources, value); }
}
// Indicates if there are any implicit styles in the ancestry
internal bool ShouldLookupImplicitStyles
{
get { return ReadInternalFlag(InternalFlags.ShouldLookupImplicitStyles); }
set { WriteInternalFlag(InternalFlags.ShouldLookupImplicitStyles, value); }
}
// Indicates if this instance has a style set by a generator
internal bool IsStyleSetFromGenerator
{
get { return ReadInternalFlag2(InternalFlags2.IsStyleSetFromGenerator); }
set { WriteInternalFlag2(InternalFlags2.IsStyleSetFromGenerator, value); }
}
// Indicates if the StyleProperty has changed following a UpdateStyleProperty
// call in OnAncestorChangedInternal
internal bool HasStyleChanged
{
get { return ReadInternalFlag2(InternalFlags2.HasStyleChanged); }
set { WriteInternalFlag2(InternalFlags2.HasStyleChanged, value); }
}
// Indicates if the StyleProperty has been invalidated during a tree walk
internal bool HasStyleInvalidated
{
get { return ReadInternalFlag2(InternalFlags2.HasStyleInvalidated); }
set { WriteInternalFlag2(InternalFlags2.HasStyleInvalidated, value); }
}
// Indicates that the StyleProperty full fetch has been
// performed atleast once on this node
internal bool HasStyleEverBeenFetched
{
get { return ReadInternalFlag(InternalFlags.HasStyleEverBeenFetched); }
set { WriteInternalFlag(InternalFlags.HasStyleEverBeenFetched, value); }
}
// Indicates that the StyleProperty has been set locally on this element
internal bool HasLocalStyle
{
get { return ReadInternalFlag(InternalFlags.HasLocalStyle); }
set { WriteInternalFlag(InternalFlags.HasLocalStyle, value); }
}
// Indicates that the ThemeStyleProperty full fetch has been
// performed atleast once on this node
internal bool HasThemeStyleEverBeenFetched
{
get { return ReadInternalFlag(InternalFlags.HasThemeStyleEverBeenFetched); }
set { WriteInternalFlag(InternalFlags.HasThemeStyleEverBeenFetched, value); }
}
// Indicates that an ancestor change tree walk is progressing
// through the given node
internal bool AncestorChangeInProgress
{
get { return ReadInternalFlag(InternalFlags.AncestorChangeInProgress); }
set { WriteInternalFlag(InternalFlags.AncestorChangeInProgress, value); }
}
// Stores the inheritable properties that will need to invalidated on the children of this
// node.This is a transient cache that is active only during an AncestorChange operation.
internal FrugalObjectList<DependencyProperty> InheritableProperties
{
get { return _inheritableProperties; }
set { _inheritableProperties = value; }
}
// Says if there is a loaded event pending
internal object[] LoadedPending
{
get { return (object[]) GetValue(LoadedPendingProperty); }
}
// Says if there is an unloaded event pending
internal object[] UnloadedPending
{
get { return (object[]) GetValue(UnloadedPendingProperty); }
}
// Indicates if this instance has multiple inheritance contexts
internal override bool HasMultipleInheritanceContexts
{
get { return ReadInternalFlag2(InternalFlags2.HasMultipleInheritanceContexts); }
}
// Indicates if the current element has or had mentees at some point.
internal bool PotentiallyHasMentees
{
get { return ReadInternalFlag(InternalFlags.PotentiallyHasMentees); }
set
{
Debug.Assert(value == true,
"This flag is set to true when a mentee attaches a listeners to either the " +
"InheritedPropertyChanged event or the ResourcesChanged event. It never goes " +
"back to being false because this would involve counting the remaining listeners " +
"for either of the aforementioned events. This seems like an overkill for the perf " +
"optimization we are trying to achieve here.");
WriteInternalFlag(InternalFlags.PotentiallyHasMentees, value);
}
}
/// <summary>
/// ResourceReferenceExpressions on non-[FE/FCE] add listeners to this
/// event so they can get notified when there is a ResourcesChange
/// </summary>
/// <remarks>
/// make this pay-for-play by storing handlers
/// in EventHandlersStore
/// </remarks>
internal event EventHandler ResourcesChanged
{
add
{
PotentiallyHasMentees = true;
EventHandlersStoreAdd(FrameworkElement.ResourcesChangedKey, value);
}
remove { EventHandlersStoreRemove(FrameworkElement.ResourcesChangedKey, value); }
}
/// <summary>
/// Mentees add listeners to this
/// event so they can get notified when there is a InheritedPropertyChange
/// </summary>
/// <remarks>
/// make this pay-for-play by storing handlers
/// in EventHandlersStore
/// </remarks>
internal event InheritedPropertyChangedEventHandler InheritedPropertyChanged
{
add
{
PotentiallyHasMentees = true;
EventHandlersStoreAdd(FrameworkElement.InheritedPropertyChangedKey, value);
}
remove { EventHandlersStoreRemove(FrameworkElement.InheritedPropertyChangedKey, value); }
}
#endregion Internal Properties
//------------------------------------------------------
//
// Internal Fields
//
//------------------------------------------------------
#region Internal Fields
// Optimization, to avoid calling FromSystemType too often
internal new static DependencyObjectType DType = DependencyObjectType.FromSystemTypeInternal(typeof(FrameworkContentElement));
#endregion Internal Fields
//------------------------------------------------------
//
// Private Fields
//
//------------------------------------------------------
#region Private Fields
// The parent element in logical tree.
private new DependencyObject _parent;
private FrugalObjectList<DependencyProperty> _inheritableProperties;
private static readonly UncommonField<DependencyObject> InheritanceContextField = new UncommonField<DependencyObject>();
private static readonly UncommonField<DependencyObject> MentorField = new UncommonField<DependencyObject>();
#endregion Private Fields
}
}
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